Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/euphrates'
  - URL correction for quickstart

    JIRA: COMPASS-564

    The current quickstart URL for stable/euphrates branch is not
    correct. This patch is proposed to fix this mistake.

    Change-Id: I36883480f2af43baca81f6107d2c2281362104d2
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>
    (cherry picked from commit a311e9f44eda91ea0fc51d3e0504290d302f97e7)

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 91c5b7e..e462fcd 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 91c5b7efc59bcf9a6482c764f4d7d2e473b8f6d2
+Subproject commit e462fcd11d06b54e5bd47cdd764b9163454b1fcf